Cinterion
®
ELS81-US Hardware Interface Description
3.5 Operating Temperatures
77
els81-us_hid_v01.004
2017-09-27
Confidential / Preliminary
Page 73 of 107
3.5
Operating Temperatures
Please note that the module’s lifetime, i.e., the MTTF (mean time to failure) may be reduced, if
operated outside the extended temperature range.
for information about the NTC for on-board temperature measurement,
automatic thermal shutdown and alert messages.
Note: Within the specified operating temperature ranges the board temperature may vary to a
great extent depending on operating mode, used frequency band, radio output power and cur-
rent supply voltage.
For more information regarding the module’s thermal behavior please refer to
.
Table 14:
Board temperature
Parameter
Min
Typ
Max
Unit
Normal operation
-30
+25
+85
°C
Extended operation
1
1. Extended operation allows normal mode speech calls or data transmission for limited time until automatic
thermal shutdown takes effect. Within the extended temperature range (outside the normal operating
temperature range) the specified electrical characteristics may be in- or decreased.
-40
+90
°C
Automatic shutdown
2
Temperature measured on ELS81-US
board
2. Due to temperature measurement uncertainty, a tolerance of ±3°C on the thresholds may occur.
<-40
---
>+90
°C
